Java String Handling Test | Core Java Topical Test (Series 1)
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Question 1 of 20
1. Question
What is the output of the following code ?
public static void main(String ags[]){
String a=”abc”;
String b=”abc”;
System.out.print(a.equals(b));
System.out.print(a==b);
}
Correct
Incorrect
Question 2 of 20
2. Question
What is the output of the following program ?
public static void main(String ags[]){
String a=”abc”;
String b=new String(“abc”);
System.out.print(a.equals(b));
System.out.print(a==b);
}
Correct
Incorrect
Question 3 of 20
3. Question
Examine this code:
String myString;
What is the data type of myString?
Correct
Incorrect
Question 4 of 20
4. Question
Output of the below program ?
public static void main(String ags[]){
String a=new String(“abc”);
String b=new String(“abc”);
System.out.print(a.equals(b));
System.out.print(a==b);
}
Correct
Incorrect
Question 5 of 20
5. Question
What sort of thing is “Nothing New” as in the following: String str = “Nothing New”;
Correct
Incorrect
Question 6 of 20
6. Question
What will be the output of the following code ?
public class Strings {
public static void main(String ads[]){
String arr[]={“meow”,”bray”,”moo”};
String a=”meow”;
System.out.println(arr[0]==a);
}
}
Correct
Incorrect
Question 7 of 20
7. Question
What is the result of the following:
String ring = “One ring to rule them all, ”
String find = “One ring to find them.”
What type of object cannot be altered after it is constructed?
Correct
Incorrect
Question 9 of 20
9. Question
What is the output of the following program ?
public class Strings {
public static void main(String ads[]){
String a=”meow”;
String ab=a+”deal”;
String abc=”meowdeal”;
System.out.println(ab==abc);
}
}
Correct
Incorrect
Question 10 of 20
10. Question
Examine this code:
String myString = “”;
What value is contained in myString?
Correct
Incorrect
Question 11 of 20
11. Question
Examine this code:
String stringA = “Wild”;
String stringB = ” Irish”;
String stringC = ” Rose”;
String result;
Which of the following puts a reference to “Wild Irish Rose” in result?
Correct
Incorrect
Question 12 of 20
12. Question
What is said of an operator like “+” when it has several meanings depending on context?
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Incorrect
Question 13 of 20
13. Question
When an object no longer has any reference variables referring to it, what happens to it?
What value is assigned to a reference value to show that there is no object?
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Question 16 of 20
16. Question
What is output?
publicclass Test10
{
publicstaticvoid main(String a[])
{
String s1 =“Sun”;
String s2 =“Java”;
s1.concat(s2);
System.out.println(s1);
}
}
Choose the correct answer
Correct
As String class is immutable – class String does not contain methods that change the content of the String object itself. The concat() method returns a new String that contains the result of the operation. Hence for above code snippet output is ‘Sun‘.
Incorrect
As String class is immutable – class String does not contain methods that change the content of the String object itself. The concat() method returns a new String that contains the result of the operation. Hence for above code snippet output is ‘Sun‘.
Question 17 of 20
17. Question
What will be result if you try to compile and run following code?
public class Record extends String{}
Correct
As String class is declared as final you cannot extend String class.
The above code snippet gives, Compile time error , “Can not extend a final class.”
Incorrect
As String class is declared as final you cannot extend String class.
The above code snippet gives, Compile time error , “Can not extend a final class.”
As s1 and s2 are s2 refer to different object, when we use == operator it checks whether two reference point two same object and equals() method checks the content of reference object. Hence when we execute above code snippet, output is – ‘false true‘
Incorrect
As s1 and s2 are s2 refer to different object, when we use == operator it checks whether two reference point two same object and equals() method checks the content of reference object. Hence when we execute above code snippet, output is – ‘false true‘
instanceof is used to check if an object is an instance of a class, an instance of a subclass, or an instance of a class that implements a particular interface. In the above code snippet str is an instance of String class, so the output is TRUE.
Incorrect
instanceof is used to check if an object is an instance of a class, an instance of a subclass, or an instance of a class that implements a particular interface. In the above code snippet str is an instance of String class, so the output is TRUE.
Question 20 of 20
20. Question
Which one of the following statements is true?
Correct
As String class is declared as final it cannot be subclassd.
Incorrect
As String class is declared as final it cannot be subclassd.